Here's what it boils down to for me:
GFE - Greets me with a smile and a hug and seems genuinely happy to see me.
Non GFE - Greets me with a list of rules
GFE - Spends the first few minutes chatting & getting to know each other, showing an interest in me as a person.
Non GFE - Spends the first few minutes explaining the price list for different options, showing an interest in me as a wallet.
GFE - Has a freshly showered scent with just a hint of perfume (not enough to get me in trouble)
Non GFE - Has a stale, "last customer" scent with more than a hint of Old Spice.
GFE - When I attempt to kiss her or ask if kissing is allowed, smiles at me and plants one on me.
Non GFE - When I attempt to kiss her or ask if kissing is allowed, gets wide eyed in horror and shrieks an emphatic "NOOO" as if I had just asked her to let me shit in her mouth.
GFE - Enjoys mutual foreplay for an extended period of time and either enjoys, or pretends to, enjoy it.
Non GFE - Gives me 2 minute unenthusiastic CBJ and then says "ya ready"?
GFE - Tries many different positions, suggesting some of her favorites and asking me what my favorites are.
Non GFE - Lays in missionary position with eyes tightly closed and arms at her sides OR insists on doggy style so she can look at anything but me.
GFE - Spends time afterwards cuddling, talking, lightly rubbing my arms or chest and smiling sweetly.
Non GFE - Jumps out of bed 5 seconds after I cum and proceeds to use alcoholic wipes on every part of her body that I might have possibly touched.
GFE - Regardless of the time, looks at me with a devilish sexy smile and says "I'm up for another round if you think you can handle more of me".
Non GFE - Slams the door shut behind her 40 minutes into the hour.
GFE - Never mentions money and upon handing her the envelope, puts it away without a word so as not to distract from the mood.
Non GFE - Rips open the envelope, counts the money (Twice) in front of me, then asks if I have "a little something extra" for her.
GFE - Stays on my mind for the next 24 hours.
Non GFE - Is forgotten 15 minutes after the session.